WebSVN – Kolibri OS – Blame – /drivers/include/linux/bitops.h

Rev	Author	Line No.	Line
1408	serge	1	#ifndef _LINUX_BITOPS_H
		2	#define _LINUX_BITOPS_H
1964	serge	3	#include
1408	serge	4
1964	serge	5	#ifdef __KERNEL__
1408	serge	6	#define BIT(nr) (1UL << (nr))
		7	#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
		8	#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
		9	#define BITS_PER_BYTE 8
		10	#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
1964	serge	11	#endif
1408	serge	12
1964	serge	13	extern unsigned int __sw_hweight8(unsigned int w);
		14	extern unsigned int __sw_hweight16(unsigned int w);
		15	extern unsigned int __sw_hweight32(unsigned int w);
		16	extern unsigned long __sw_hweight64(__u64 w);
		17
1408	serge	18	/*
		19	* Include this here because some architectures need generic_ffs/fls in
		20	* scope
		21	*/
		22	#include
		23
1964	serge	24	#define for_each_set_bit(bit, addr, size) \
1408	serge	25	for ((bit) = find_first_bit((addr), (size)); \
		26	(bit) < (size); \
		27	(bit) = find_next_bit((addr), (size), (bit) + 1))
		28
3031	serge	29	/* same as for_each_set_bit() but use bit as value to start with */
		30	#define for_each_set_bit_from(bit, addr, size) \
		31	for ((bit) = find_next_bit((addr), (size), (bit)); \
		32	(bit) < (size); \
		33	(bit) = find_next_bit((addr), (size), (bit) + 1))
		34
		35	#define for_each_clear_bit(bit, addr, size) \
		36	for ((bit) = find_first_zero_bit((addr), (size)); \
		37	(bit) < (size); \
		38	(bit) = find_next_zero_bit((addr), (size), (bit) + 1))
		39
		40	/* same as for_each_clear_bit() but use bit as value to start with */
		41	#define for_each_clear_bit_from(bit, addr, size) \
		42	for ((bit) = find_next_zero_bit((addr), (size), (bit)); \
		43	(bit) < (size); \
		44	(bit) = find_next_zero_bit((addr), (size), (bit) + 1))
		45
1408	serge	46	static __inline__ int get_bitmask_order(unsigned int count)
		47	{
		48	int order;
		49
		50	order = fls(count);
		51	return order; /* We could be slightly more clever with -1 here... */
		52	}
		53
		54	static __inline__ int get_count_order(unsigned int count)
		55	{
		56	int order;
		57
		58	order = fls(count) - 1;
		59	if (count & (count - 1))
		60	order++;
		61	return order;
		62	}
		63
		64	static inline unsigned long hweight_long(unsigned long w)
		65	{
		66	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
		67	}
		68
		69	/**
3031	serge	70	* rol64 - rotate a 64-bit value left
		71	* @word: value to rotate
		72	* @shift: bits to roll
		73	*/
		74	static inline __u64 rol64(__u64 word, unsigned int shift)
		75	{
		76	return (word << shift) \| (word >> (64 - shift));
		77	}
		78
		79	/**
		80	* ror64 - rotate a 64-bit value right
		81	* @word: value to rotate
		82	* @shift: bits to roll
		83	*/
		84	static inline __u64 ror64(__u64 word, unsigned int shift)
		85	{
		86	return (word >> shift) \| (word << (64 - shift));
		87	}
		88
		89	/**
1408	serge	90	* rol32 - rotate a 32-bit value left
		91	* @word: value to rotate
		92	* @shift: bits to roll
		93	*/
		94	static inline __u32 rol32(__u32 word, unsigned int shift)
		95	{
		96	return (word << shift) \| (word >> (32 - shift));
		97	}
		98
		99	/**
		100	* ror32 - rotate a 32-bit value right
		101	* @word: value to rotate
		102	* @shift: bits to roll
		103	*/
		104	static inline __u32 ror32(__u32 word, unsigned int shift)
		105	{
		106	return (word >> shift) \| (word << (32 - shift));
		107	}
		108
		109	/**
		110	* rol16 - rotate a 16-bit value left
		111	* @word: value to rotate
		112	* @shift: bits to roll
		113	*/
		114	static inline __u16 rol16(__u16 word, unsigned int shift)
		115	{
		116	return (word << shift) \| (word >> (16 - shift));
		117	}
		118
		119	/**
		120	* ror16 - rotate a 16-bit value right
		121	* @word: value to rotate
		122	* @shift: bits to roll
		123	*/
		124	static inline __u16 ror16(__u16 word, unsigned int shift)
		125	{
		126	return (word >> shift) \| (word << (16 - shift));
		127	}
		128
		129	/**
		130	* rol8 - rotate an 8-bit value left
		131	* @word: value to rotate
		132	* @shift: bits to roll
		133	*/
		134	static inline __u8 rol8(__u8 word, unsigned int shift)
		135	{
		136	return (word << shift) \| (word >> (8 - shift));
		137	}
		138
		139	/**
		140	* ror8 - rotate an 8-bit value right
		141	* @word: value to rotate
		142	* @shift: bits to roll
		143	*/
		144	static inline __u8 ror8(__u8 word, unsigned int shift)
		145	{
		146	return (word >> shift) \| (word << (8 - shift));
		147	}
		148
1970	serge	149	/**
		150	* sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit
		151	* @value: value to sign extend
		152	* @index: 0 based bit index (0<=index<32) to sign bit
		153	*/
		154	static inline __s32 sign_extend32(__u32 value, int index)
		155	{
		156	__u8 shift = 31 - index;
		157	return (__s32)(value << shift) >> shift;
		158	}
		159
1408	serge	160	static inline unsigned fls_long(unsigned long l)
		161	{
		162	if (sizeof(l) == 4)
		163	return fls(l);
		164	return fls64(l);
		165	}
		166
		167	/**
		168	* __ffs64 - find first set bit in a 64 bit word
		169	* @word: The 64 bit word
		170	*
		171	* On 64 bit arches this is a synomyn for __ffs
		172	* The result is not defined if no bits are set, so check that @word
		173	* is non-zero before calling this.
		174	*/
		175	static inline unsigned long __ffs64(u64 word)
		176	{
		177	#if BITS_PER_LONG == 32
		178	if (((u32)word) == 0UL)
		179	return __ffs((u32)(word >> 32)) + 32;
		180	#elif BITS_PER_LONG != 64
		181	#error BITS_PER_LONG not 32 or 64
		182	#endif
		183	return __ffs((unsigned long)word);
		184	}
		185
		186	#ifdef __KERNEL__
		187
1970	serge	188	#ifndef find_last_bit
1408	serge	189	/**
		190	* find_last_bit - find the last set bit in a memory region
		191	* @addr: The address to start the search at
		192	* @size: The maximum size to search
		193	*
		194	* Returns the bit number of the first set bit, or size.
		195	*/
		196	extern unsigned long find_last_bit(const unsigned long *addr,
		197	unsigned long size);
1970	serge	198	#endif
1408	serge	199
		200	#endif /* __KERNEL__ */
		201	#endif

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(root)/drivers/include/linux/bitops.h – Rev 3031